Parks Victoria has announced that the Grampians National Park Management Plan will be reviewed, starting in July 2019. There have been a few issues raised about the park that you may have seen in the media (and in the forums on this site), largely around rock climbing and Aboriginal rock art, but hiking, camping, bush camping and the Grampians Peak Trail will also be up for review or comment. If you are interested and want to find you more, or want to be kept up to date with where the review is at and provide a few comments, you should register at Engage Victoria.
https://engage.vic.gov.au/grampians-management-plan